谓语受主语支配,它必须在人称和数等方面与谓语保持一致。
I 语法形式上一致
单数的名词、代词、动词不定式、动名词短语或从从句作主语时,谓语动词用单数。
What I hate most is telling lies.
To become a doctor is his ambition.
Whether she comes or not is of no matter
what引导的从句作主语,如果它后面的表语是复数形式,谓语动词亦可以用复数。
What I said is right.
What we need badly here are doctors.
由and连接并列主语时:
1)一般情况下谓语用复数。
What she says and what she does dont agree
Swimming in the summer and skating in the winter are my hobbies
In the city are to be found both the most renowned scholar and the scoundrels
2)并列的主语如果表示同一个人、同一事物或同一概念时,谓语动词用单数形式,而且and后面的名词前没有冠词或物主代词修饰。
My house and home is at 1707 Maryland drive.
Bread and butter is daily food for breakfast.
Her best friend and adviser has changed her idea again.
The Air-Marshal and Chief-of-Staff was killed in the air crash.
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